Is CVE-2013-4366 actively exploited?

CVE-2013-4366 has no public evidence of in-the-wild exploitation as of 2025-04-20.

What is the CVSS score for CVE-2013-4366?

CVE-2013-4366 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2013-4366?

Patch guidance is available from apache security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2013-4366.

Fix CVE-2013-4366 - CRITICAL apache httpclient

Q: Which products are affected by CVE-2013-4366?

4 products: apache httpclient, apache httpclient, apache httpclient, apache httpclient.

Description

http/impl/client/HttpClientBuilder.java in Apache HttpClient 4.3.x before 4.3.1 does not ensure that X509HostnameVerifier is not null, which allows attackers to have unspecified impact via vectors involving hostname verification.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-20 · Improper Input Validation

Metadata

Primary Vendor: APACHE
Published: 10/30/2017
Last Modified: 4/20/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2013-4366

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary